Chables h



(No Model.)

C. H. HINDS.

JOINT TOR ELECTRIC LIGHT BRAGKBTS. No. 282,317. f Pa'tentedJuly 31.1883-.

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UNITED STATES PATENT Prien@ CHARLES H. HlNDS, OF NEV YORK, N. Y.

JOINT FOR ELECTRIC-LIGHTI BRACKETS.v

SPECIFICATION forming part of Letters Patent No. 282,317, dated July 31,17883.

Application filed December 20, 1882. (No model.)

Tov all whom, it may concern:

Beit known that I, GrrARLEs H. HINDs, a citizen of the United States,residing at New York, in the county and State of New York, have inventednew and useful Improvements in Joints for ElectricLight Brackets, ofwhich the following is a specication.

This invention relates to a bracket-j oint which is so constructed thata permanent and positive connection of the conducting-wires ismaintained, whatever may be the position of the joint, and at the sametime an open passage for illuminating-gas is maintained.

Thepeculiar and novel construction of my bracket-joint is pointed out inthe following speciiication and -illustrated in the accompanyingdrawings, in which- Figure l represents a vertical central section. Fig.2 is a horizontal section in the plane m Fig. 1, looking in thedirection of arrow l. Fig. 3 is a similar section of the same, looking`in the direction of arrow 2.

. Similar letters indicate corresponding parts. In the drawings, theletter A designates a short tube, which is provided with internalscrew-threads, a b, at both ends, and with a tubular projection, c, onone side, into which is fitted a pipe, B.' ln the interior of the tube Ais firmly secured by set-screws d d, Fig. 2, a compound plug, C, twosides of which are cut away, so as to leave open spaces for the passageof the illuminating-gas. Said compound plug consists of a centralmetallic stud, c, a metallic ring, f, and an insulating-sup port, g, thestud e extending through the center of this support, while the ring fembraces the same at its top. The upper surfaces of the stud and of thering project above the surface of the insulating-support. To themetallic stud c is secured by a clamping-screw, h, the conductor 10,while the other conductor, 11, is secured to the plug C by aclampingscrew, z', which is in metallic contact with the ring f, butinsulated from the stud e.

Into the top of the tube A is itted the swivel-head D, from oneV side ofwhich extends the pipe E. Into the inner end of said swivel-head isfitted the compound plug F,

Fig. 4, the stud j and ring It' being made to project beyond the exposedsurface of the insulating-support.

On the inner edge of the swiv`cl-head D is formed a shoulder, m, andover this shoulder is placed a screw-cap, G, which nts the screwthreadin the upper end of the tube A. By means of this screw-cap theswivel-head is depressed and the exposed surfaces of the stud j and ring7c of the plug F can be brought in close contact with the exposedsurfaces of the stud e and ring f of the plug C.

In order to insure perfect metallic contact, the exposed surfaces of thestuds j c and rings kf are ground together, so that the swivelhead canbe turned round without disturbing such contact. rlhe shoulder m of theswivelhead is ground against the inner surface of the screw-cap G, andthis cap is provided with a jam-nut, n, so that it can be locked in therequired position.

The conductor l0* is secured to the plug F by the clamping-screw o,which is in metallic contact with the stud j and the conductor 11* iseither soldered or otherwise firmly secured to the metallic ring lc. Thebottom end ofthe tube A is closed by screw-cap H, and the conf ductors10* 1l* pass freely through channels formed for this purpose in theinsulating-sup port Z of the plug F, leaving sufficient space for thepassage of the illuminating-gas.

From this description it will be seen that if the pipe B is stationarythe pipe E, with the swivel-head D, plug F, and conductors 10d lldi, canbe freely turned in either direction without disturbing the positivemetallic contact between the conductors l0* l() and 11:A

IOO

fore described, of the tube A, the compound plug C, composed ol' themetallic stud c, nietallie ring j', aud insulating-support g, theswivel-head D, the compound plug F, composed of the metallic stud 7' themetallic ring` kg and the insu]ating-support Z, and the conductors l0*l1* l0 1l, fastened to the studs cj and ringsflr, respectively, so as topreserve a permanent positi ve metallic contact between the conductorsl0* 10 and 11.* 1l, respective 1o ly, if the swiveled head is turnedround. In testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

CHAS. lil. HINDS. [L s] lVituesses W. HAUFF,

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